Lee Purdy heads to Atlantic City this weekend looking to pull off the biggest world-title upset since Buster Douglas flattened Iron Mike Tyson when he meets Devon Alexander for the IBF welterweight strap.

Colchester battler Purdy, 20-3-1 (13) only gets this gig due to the fact that original Alexander opponent Kell Brook is out injured and few outside of his camp are giving him much of a shot. That's because slick American Alexander looks the real deal, having lost just once in 25 fights since turning over in 2004. That was a technical decision loss to Tim Bradley so it's little wonder the layers have him chalked up as a 1/20 shot at the Boardwalk Hall.

I make those odds about right as this game is all about levels and I don't see how 12/1 shot Purdy can spring a shock this weekend. To paraphrase the great Don King, 'Lights Out' Purdy has two chances: slim and none. And slim just left town.

If you are looking to have a bet on the boxing this week, however, look no further than the Prizefighter tournament - the third cruiserweight event takes place at York Hall in Bethnal Green on Saturday.

It's the 30th Prizefighter event and the eight-man slugfest should be worth a watch.

Neil Dawson is the favourite with the layers after his impressive first-round blowout of Tony Conquest (another fighter in the draw) last December.

Dawson has a decent 11-1 (4) record and has already boxed for the British title, losing to Matty Askin in Wigan back in 2011. Dawson is decent enough but at 32 has probably reached his potential and he looks plenty short at the prices given who is in the field.

Shane McPhilbin has already reigned as British cruiser boss and the crude but heavy-handed Bulwell man will have his supporters at double-digit prices. He beat Leon Williams for the British belt in January 2012 and after that had former WBO world cruiserweight champion Enzo Maccarinelli on the floor in the first and third round of a fantastic title defence before losing his belt on points in controversial fashion. He's lost three on the bounce since then, however, and while he has the brute force to shock one of the favourites I don't feel he has the skills or the stamina to win the thing.

Wadi Camacho should be fun to watch. The Canning Town southpaw has lost just once in seven fights since turning over last year and that defeat came in an absolute war against China Clark at the Wembley Arena back in March. He comes for a tear-up and won't fear anyone in this field. Like McPhilbin though he is a bit limited defensively and I am not sure he has the tools to nagate a path past three fights in one night.

Conquest, Nathan Owens and Hari Miles are also involved, but all three have struggled for form in recent times and look boxers to swerve.

Conall Carmichael is a former doorman who has won all four pro starts and will not be short of followers in East London. However, he is 34 and has yet to box outside his native Belfast so might freeze amid the bright lights of the Sky TV glare.

Not so Danny McIntosh, a savvy and well-schooled Norwich stylist who has already won British and European titles at the weight.

'Big Mac' has four losses on his record and has actually lost his last three fights but two of those defeats came against top domestic men in Nathan Cleverly and Tony Bellew. He was giving the latter something of an argument in their British title scrap in Liverpool last year before being taken out in the fifth.

Of all the combatants I feel that McIntosh's busy and elusive style means he is best suited to this type of format.

If he has any ambition left the 13-4 (7) switch-hitter is my pick to cut a swathe past a fairly game but limited bunch, bank £32,000 and put himself back in the shop window for meaningful fights at 14st 4lbs.